2007 Chevy Express 3500 Collins bus

[dlhodge]

I need some help. The bus was gutted and rear AC and heater was disconnected. I removed the wiring and panel above cab. I checked that the bus started each time I removed a wire, but neglected to see if the dash AC and Heater worked each time. Never thought those would be connected into the panel above. I found in another post that removing the CR and CLR connections would stop the heater and AC. Does anyone know how I can rewrite these from the dash to get them to work again?

 

[Slapdash]

I'll leave this for the experts here, but when I disconnected mine, similar AC/heater, mine still kept working. I think I just dead-ended the wires before they went to those devices, sealed them with heat-shrink and left them in the overheard section and up under the dash, where my aux heater controls were. You could, perhaps, rebuild what you took out. Mine is a similar model too, '05 GMC 3500, with a Corbeil coach.

Also, because Collins is still in business, you might be able to holler at them and get the schematics so you can trace where things go.

Good luck!

 

[Jolly Roger bus 223]

my wifes 04 express collins body had dash AC and it had two bulkhead units that were gone when i bought the bus. the CLR CSR and C? relay is where the command for dash AC came from and of course i didnt know that at the time either. i put the parts from a suburban condensor in front of the radiator and a compressor and got the hoses from parts geek for an express and use a toggle switch to command on and off.

 

[dlhodge]

my wifes 04 express collins body had dash AC and it had two bulkhead units that were gone when i bought the bus. the CLR CSR and C? relay is where the command for dash AC came from and of course i didnt know that at the time either. i put the parts from a suburban condensor in front of the radiator and a compressor and got the hoses from parts geek for an express and use a toggle switch to command on and off.

Sorry but I'm still trying to understand what to do. I understand adding the toggle switch, but won't the existing condensor and compressor work without adding another?

 

[Foamenter]

I have a 2009 Collins Express 3500. I basically did the same thing on mine, just disconnecting all of that wiring for the rear AC and heat. I can confirm that the dash AC still works, but I have not tested the dash heat. I have no reason to believe it doesn't work though.

When I got my bus I contacted Collins and they did provide schematics for my particular bus.

I can send those over if you want to have a look. I haven't looked at them in a while, so I don't recall if the wiring for that rear AC and heat was on there, but it probably is.

Edit: link to the ac schematics

Schematic - AC.pdf

drive.google.com